From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 016C8C6786E for ; Fri, 26 Oct 2018 16:35:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8EB6A20868 for ; Fri, 26 Oct 2018 16:35:48 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8EB6A20868 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=alien8.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727567AbeJ0BN3 (ORCPT ); Fri, 26 Oct 2018 21:13:29 -0400 Received: from mail.skyhub.de ([5.9.137.197]:60426 "EHLO mail.skyhub.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726159AbeJ0BN3 (ORCPT ); Fri, 26 Oct 2018 21:13:29 -0400 X-Virus-Scanned: Nedap ESD1 at mail.skyhub.de Received: from mail.skyhub.de ([127.0.0.1]) by localhost (blast.alien8.de [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id 20B6_MW6XUMc; Fri, 26 Oct 2018 18:35:45 +0200 (CEST) Received: from nazgul.tnic (unknown [185.30.24.106]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.skyhub.de (SuperMail on ZX Spectrum 128k) with ESMTPSA id 53F3E1EC05B0; Fri, 26 Oct 2018 18:35:45 +0200 (CEST) Date: Fri, 26 Oct 2018 18:35:54 +0200 From: Borislav Petkov To: lijiang Cc: linux-kernel@vger.kernel.org, kexec@lists.infradead.org, tglx@linutronix.de, mingo@redhat.com, x86@kernel.org, bhe@redhat.com, dyoung@redhat.com Subject: Re: [PATCH] kdump, vmcoreinfo: Export sme_me_mask value to vmcoreinfo Message-ID: <20181026163554.GA26331@nazgul.tnic> References: <20181026093630.8520-1-lijiang@redhat.com> <053CC83A-9A95-4C12-9627-AABD1427DA9C@alien8.de> <1263471c-a27d-a698-15f0-b5947f13ea93@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <1263471c-a27d-a698-15f0-b5947f13ea93@redhat.com> User-Agent: Mutt/1.6.0 (2016-04-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Oct 26, 2018 at 08:32:11PM +0800, lijiang wrote: > If SME is enabled in the first kernel, the crash kernel's page table(pgd/pud/pmd/pte) > contains the memory encryption mask, so i have to remove the sme mask to obtain the > true physical address when dump vmcore. Sorry, I have no clue what makedumpfile does exactly so you'd have to be more detailed (or wait until I look at it :)). Which kernel accesses which kernel's pagetable? /me goes and looks at the makedumpfile's manpage... Ok, it uses vmcoreinfo to exclude pages which would mean, it accesses the first kernel's pagetable and traverses it. Am I close? -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. --